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3, 21, 144, 1085, 8685, 72381, 620420, 5428680, 48254941, 434294481, 3948131653, 36191206824, 334072678386, 3102103442165, 28952965460216, 271434051189531, 2554673422960304, 24127471216847323, 228576043106974645, 2171472409516259137, 20680689614440563220
(列表;图表;参考;听;历史;文本;内部格式)
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